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Sierra Bighorns on Ledge of Breakthrough

From a perch above a boulder-strewn ravine, we peered with binoculars up canyon walls and across a steep jumble of rocks and dirt for endangered Sierra Nevada bighorn sheep.        

The arrival of spring in the high country is when Sierra bighorns feast on fresh, water-saturated forage in the front country of the Eastern Sierra Nevada outside Bishop.

A warm, dry breeze pushed out of the north. The scent of sage was in the air. At the mouth of Sawmill Canyon, on a steep mountain face below a towering monolith, we found pockets of greenery amid the rocks. We scanned sections, segment-by-segment, for the silhouette of a Sierra bighorn, attracted there to feed.

“Nothing yet,” I said to Tom Stephenson, our mentor and program leader for the Sierra Nevada Bighorn Sheep Recovery Program of the California Department of Fish and Wildlife.

“We know they’re in there,” he said.

Sierra bighorns, he noted, can seem nearly invisible. Their ability to blend against the rock is a defense against predators. When you finally see one, others nearby can suddenly appear as if out of nowhere.

To some, the spike in population also seems to have come out of nowhere. In the late 1990s, about 100 Sierra bighorns were thought to be left on the planet; the latest count was roughly 600. This spring’s count is expected to be lower, Stephenson said, “as a result of heavy snow and mountain lion predation.” But Stephenson said the Sierra bighorn population could sustain its long-term expansion in the next few years and could be relisted from endangered to threatened.

Landmark breakthroughs could help assure that:

Domestic sheep threat: In March, the Mono County Board of Supervisors voted 3-1 to reject a grazing lease for domestic sheep near the range of the Sierra bighorn. That is critical because domestic sheep remain the biggest long-term obstacle to recovery, Stephenson said. In the 1850s, when early pioneers arrived to California, thousands of Sierra bighorns roamed the high country, Stephenson said. The pioneers brought herds of domestic sheep, which infected the bighorns with disease, killing them.

Mountain lion threat: For several years, the Mountain Lion Foundation has softened its stance toward the DFW killing lions in favor of protecting endangered Sierra bighorns. Without pushback, the DFW has identified and killed 24 lions that were specifically targeting bighorns in threatened herds. “When there were thousands of Sierra bighorns, the size of the herd could handle occasional predation,” Stephenson said. “When you have a few hundred animals of a species left in the world, every individual becomes important.”

End of a severe winter: In the desolation of the Eastern Sierra, the arrival of spring means more water-filled plants are available, which can lead to better health of ewes and higher survival rates of lambs. “We believe we have turned the tide for the recovery of Sierra Nevada bighorn sheep,” said Ginnie Chadwick, a scientist who volunteers with the Sierra Nevada Bighorn Sheep Foundation.

The best place to find and see Sierra bighorn is out of the town of Bishop, about an hour south of Mono Lake. From San Francisco, Sacramento or anywhere else west of the Sierra, it can be a mind-bending drive.

The range of the Sierra bighorn includes some of the most foreboding, steep and desolate high country in America.

Over the years, I’ve spotted and stalked Sierra bighorn in several areas. In the Eastern Sierra, I’ve had the best luck up Pine Creek Canyon, the canyons just above the floor of Round Valley, Sawmill Canyon and Taboose Canyon. Another good spot, east of Bishop, is up Silver Creek Canyon on the flank of White Mountain, for a subspecies, the desert — or Nelson — bighorn. For that trip, which includes a creek crossing, a four-wheel drive vehicle with high clearance is required.

A new herd was transplanted in 2015 in the Cathedral Range of Yosemite National Park. It takes a combination of backpacking, trekking and rock climbing to get close. Jen Joynt of Berkeley, who won the DFW’s first-place award for best wildlife photo of the year in 2016, said she made the attempt last fall, but was unable to get a photo.

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  • Last modified on Monday, 29 May 2017 23:42
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